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#1
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
I have stereo speakers powered by an amp; an active centre speaker
running off a stereo mixer to mono box and an active mono sub-woofer - all by different manufacturers and vintage. How can I make sure that they are in phase and not cancelling each other out? There are plently of test tracks with which I can test the stereo speakers - but I don't know how to test the whole system. Any thoughts? DAvy |
#2
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
To put each amp speaker pair in the same "phase":
Using a battery test which wire produces the same forward or backward pulse. When each wire pair is tested connect to the same terminal on each amp accordingly. |
#3
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
"Davy" wrote in message
... I have stereo speakers powered by an amp; an active centre speaker running off a stereo mixer to mono box and an active mono sub-woofer - all by different manufacturers and vintage. How can I make sure that they are in phase and not canceling each other out? There are plenty of test tracks with which I can test the stereo speakers - but I don't know how to test the whole system. Set your system up so that you are playing exactly the same music at the same loudness through each and every speaker. The source should be mono. Then walk around the room, standing between the speakers in pairs. You should be able to position yourself so that the sound appears to be coming from a virtual image between each pair of speakers. This may be hard to do with the subwoofer. Check its polarity by trying both polarities and picking the one that gives you the best bass. |
#4
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
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#6
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
On Wed, 10 Jun 2009 07:24:37 -0700, Arny Krueger wrote
(in article ): "Davy" wrote in message ... I have stereo speakers powered by an amp; an active centre speaker running off a stereo mixer to mono box and an active mono sub-woofer - all by different manufacturers and vintage. How can I make sure that they are in phase and not canceling each other out? There are plenty of test tracks with which I can test the stereo speakers - but I don't know how to test the whole system. Set your system up so that you are playing exactly the same music at the same loudness through each and every speaker. The source should be mono. Then walk around the room, standing between the speakers in pairs. You should be able to position yourself so that the sound appears to be coming from a virtual image between each pair of speakers. This may be hard to do with the subwoofer. Check its polarity by trying both polarities and picking the one that gives you the best bass. I'd leave the subwoofer DISCONNECTED for Arny's phase test. After you are sure that the left, right, and center speakers are all in-phase, then connect your sub and try reversing the polarity. The polarity that gives the best bass will be proper, irrespective of it's electrical phase in relationship with the other speakers. |
#7
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
On Jun 8, 4:04*pm, Davy wrote:
I have stereo speakers powered by an amp; an active centre speaker running off a stereo mixer to mono box and an active mono sub-woofer - all by different manufacturers and vintage. How can I make sure that they are in phase and not cancelling each other out? *There are plently of test tracks with which I can test the stereo speakers - but I don't know how to test the whole system. Any thoughts? DAvy Gross problems can be detected by a test DVD like Avia and you can invert polarity of the passive speakers to correct. Most sub-woofers have a phase switch, and if not it should be easy enough to reverse the leads inside. You can't get away from lesser problems without making more serious equipment changes. Without using linear phase digital filters, filler drivers, or first order cross-overs your speakers have an all-pass response. Second order cross-overs are first order all-pass filters with 0 to 180 degrees of phase shift. Fourth order cross-overs have 0 to 360 degrees of phase shift. Where the center and mains aren't identical in driver compliment and cross-over frequencies+slopes they're not going to sum the same at different frequencies. Low-frequency roll-off can have some effect too, with the speakers' minimum phase high-pass response implying phase lead. |
#8
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
On Jun 8, 4:04*pm, Davy wrote: I have stereo speakers powered by an amp; an active centre speaker running off a stereo mixer to mono box and an active mono sub-woofer - all by different manufacturers and vintage. How can I make sure that they are in phase and not cancelling each other out? *There are plently of test tracks with which I can test the stereo speakers - but I don't know how to test the whole system. Any thoughts? DAvy The standard test for system polarity is to play some music with a known good bass line. Reverse the connections to one of the speakers and the connection that provides the maximum bass is the correct polarity. Greg |
#9
Posted to rec.audio.high-end
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Balancing Multiple Speakers/Amps
On Jun 8, 4:04*pm, Davy wrote:
I have stereo speakers powered by an amp; an active centre speaker running off a stereo mixer to mono box and an active mono sub-woofer - all by different manufacturers and vintage. How can I make sure that they are in phase and not cancelling each other out? *There are plently of test tracks with which I can test the stereo speakers - but I don't know how to test the whole system. Any thoughts? DAvy The standard test for system polarity is to play some music with a known good bass line. Reverse the connections to one of the speakers and the connection that provides the maximum bass is the correct polarity. Greg |
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